I just thought I would look at the 1911 census and the below is what I have found for a William Poplett.
Family living at 15 Coningham R S Bush, Hammersmith, London & Middlesex
Residents are Alfred and Carrie Poplett are the parents. The children are given as George Poplett 1893, Nellie Hanham 1894 (step-daughter), Alfred Poplett (1895), May Poplett (1904), Rose Poplett (1906) and William Poplett (1908).
Although May is down as Poplett her birth registration is
HANHAM, MAY POPLETT COX
GRO Reference: 1903 J Quarter in FULHAM Volume 01A Page 205
There doesn't appear to be a birth record for Nellie.
George???
POPLETT, GEORGE ALFRED HARMAN
GRO Reference: 1892 D Quarter in FULHAM Volume 01A Page 226
Looks as if Caroline is Alfred's second wife, this appears to be his first
Marriages Dec 1891
Harman Agnes Fulham 1a 518
Poplett Alfred Fulham 1a 518
The original of the 1911 claims marriage of 8 years and six children, so someone taking liberties with the truth somewhere.